Arrangement of the lubricating-oil pump on internal combustion engines



D. Q, M U P, v s RE im mma HHN@ Nmml v .Luz c/f RLW EEO C Tm. D l L, d HM-FMG ORM C EF, SWT EN v. .M,T. AN O Feb. 17, 1959 ARRANGEMENT oF THE LUBRICATING-on.

PUMP. N INTERNAL coMBUsTIoN ENGINES Animas scheiterlein and Othmar ska'fsche, Graz, Austria; assignors to Gustav Ospelt, Vaduz, Liechtenstein Application December;2l),'1955, Serial No. 554,296

Claims priority, application Austria' December 23, 1954 1 claim. (ci. 12a- 195) The invention relates to an internal combustion engine with cylinders arranged in a row or rows, and a lubricating-oil pump of the geared type located beneath a cover plate at the front side of the engine.

In various known constructions, gear wheels have already been utilized to form or drive the lubricating-oil pump. In one known construction, the two gear wheels forming the lubricating-oil pump are sunk in an appropriate recess of the front bearing supporting wall, covered by a cover plate and driven by a pinion on the crankshaft through an idler. The suction duct of the pump is connected to the rear of the supporting wall and the delivery duct leads inside the supporting wall through the front end crankshaft bearing to the other points of lubrication. The complete lubricating-oil pump except for part of the oil-pressure regulator incorporated in the axle of a pair of gear wheels above the crankshaft, is located beneath a cover plate. This construction has the disadvantage of constituting a single unit with the engine so that it cannot be examined and adjusted independently from the engine. Besides, an additional number of attachment surfaces on the crankcase not lying in the same plane with the attachment surface of the cover plate, will have to be machined, involving a substantial increase in labor cost. Moreover, the cover plate can be removed only after dismantling the pressure regulator of the lubricating-oil PUmP- Another known construction provides for the direct utilization of the control wheels for the delivery of the lubricating oil. lIn a similar construction, the gear wheel mounted on the camshaft dips into the oil sump and delivers the oil through an idler to the pinion on the crankshaft, from where it is further delivered to the connecting rods through appropriate radial and axial bores in the pinion. With this construction, all of the above mentioned three gear wheels are located in closed spaces of the wall of the cover plate for control, said cover plate being mounted in different planes on the crankcase. With this construction, the lubricating-oil pump does not constitute an independent unit either, but is structurally combined with the engine. This construction is not applicable at al1 to two-stroke internal combustion engines with piston-controlled inlet and exhaust ports and consequently, without control gear wheels.

It is also known to design the lubricating-oil pump with a housing of its own as a separate unit located outside the cover plate, which requires at least one attachment surface to be machined separately, unless special lubricating-oil ducts are necessary, too. The arrangement of the oil pump unit beneath the cover plate has so far been discarded in a desire to avoid any enlargement of the relatively low cover plate and consequently, the extension of the overall length of the engine. Besides, there was the ditliculty of arranging the pipes leading to and from the lubricating-oil pump beneath the cover plate.

These diilculties are eliminated according to the invention by constructing the lubricating-oil pump in a manner knownper se with its ownhousing as a separate i unitwhose attachment surface` lies in a commonplane with the surface of attachment of the cover plate which is'traversedlby theducts leading to and from the lubrleating-oil pump. As a result, :a single planejof attach-- ment for the `coverfplate` and` the lubricating o lljpumpl including the pipe connections will suilice, whichjgreatly` facilitates machining and assembling. At thesame time, the overall height of `the, lubricating-oil pump can be reduced suicientlyby the arrangement of ducts, lso as to avoid-,any vincrease inthe height of the cover plate and consequently, in the overall length of the engine;

The lubricating-oilpumpcan be assembledand examined"r as a separate unit. f

According to another feature of the invention it is proposed to close the inner space containing the gear wheels and the suction duct of the housing of the lubrieating-oil pump on the side of the engine in a manner known per se by means of a cover plate whose surface of attachment also lies in the common plane. This simplifies the construction of the lubricating-oil pump and permits a compact design of the front cover plate.

In a further embodiment of the invention as applied to engines with a liquid cooling system, the surface of attachment of the coolant pump located at the front end of the engine may be situated in a common plane with the surfaces of attachment of the cover plate and the lubricating-oil pump thus further simplifying machining.

The features and advantages of the invention will become apparent from the subsequent description of an embodiment of same.

In the schematic drawing: t

Figure l is a fragmentary side elevational view, partly in cross section taken along the line I-I of Figure 2 as viewed from the side.

Figure 2 is an elevational view of the front end area showing a cross-section of the lubricating-oil pump taken along the line II-II of Figure 3, and

Figure 3 is a cross-sectional view taken along the line III- III of Figure 2 on an enlarged scale.

The crankcase is designated at 1, the cylinder head at 2 and the crankshaft at 3. At the front face of the engine a'cover plate 4 is provided which is traversed by the properly sealed crankshaft 3. The frontal crankshaft main bearing 5 is shown only partly in Figure l.

A V-belt pulley 6 is keyed onto the extremity of the crankshaft 3, protruding from the cover plate 4 and secured by means of a screw 7. The V-belt pulley 6 serves to drive auxiliary machines (not shown) such as the scavenging-air blower or the dynamo. The coolant pump 8 is driven by the V-belt pulley of one of the auxiliary machines in a manner not shown in the drawing through' the V-belt pulley 9. The coolant is sucked in through the pump intake 10 and directly delivered through ducts (not shown) traversing the surface of attachment 11 to the coolant space of the engine.

Below the cover plate 4 the balancing mass 12 rotating at crankshaft speed is located and secured to a shaft 13. The lubricating-oil pump 14, also arranged below the cover plate 4 comprises a support-like housing 15 in which the pair of gear wheels 16, 17 is located. The suction duct of the lubricating-oil pump is designated at 18, the delivery duct at 19 and the pressure-regulating valve at 21. The delivery duct 19 extending through the surface of attachment 20 of the oil pump, opens directly into the corresponding oil-pressure duct 26. The surface of attachment 20 of the lubricating-oil pump 14, the surface of attachment 25 of the cover plate 4 and the surface of attachment 11 of the coolant pump 8 lie in one plane. The suction duct 18 traversing said plane is connected to an exposed piping 28 leading to the. oil sump. The

l Patented Feb. .17, 1959i body of the pump containing the two gear wheels 16 and 17, including partv ofthe suction duct 18 is covered by a-cover plate 29 secured to the housing 15 by means of a plurality of screws 22. One of the two screws by which the oil pumphousing 15 is secured to the crankcase 1, is designated at 22. is driven by means ofa pair of gear wheels y23, 24-located between the cover plate 4` and the oil pump. The gear Wheel 23 is keyed onto the crankshaft 3 and the gear shaft 27 wheel 2'4 is rotatingly connected to the driving of the oil pump` l We claim:

l In an internal combustion engine with cylinders arranged in a row, the combination comprising a crankcase having a planar front side and including a wall with a delivery duct for lubricating oil opening through the front side of the crankcase, a cover including a surface of attachment to the crankcase front side coplanar with The lubricating-oil pumpA the front side of the crankcase, a lubricating oil pump of the gear type and including a housing separate from the cover and disposed between the crankcase and the cover and having an attaching surface coplanar with the front side of the crankcase and a chamber for the pump gear, the pump housing containing a delivery duct in registry with the rst delivery duct and also containing a suction duct opening at the front side of the crankcase, and a closing plate covering the gear chamber and having a surface of attachment to the pump housing coplanar with the frontside `of the crankcase.

References Citedv in the `file of this patent UNITEDSTATES PATENTS Barrett Dec. 20, 1927 

